I wouldn't do this. Whenever anything like this is done in school it's important not to keep the animals out of their environment for a long time and then they should go back exactly where you get them from., and it's always important to teach the children this. I imagine you'll not be going outside in your interview suit to get them just before you set off or before you go into the school. Why not visit the school before hand and have a look at their grounds? You could decide if it would be appropriate to go on a minibeast hunt? Or print some colour pictures out and hide them around the classroom/foundation area?